Evaluation of the Efficacy of Varenicline on Cognition, Safety, Tolerability and Pharmacokinetics in Subjects With Mild-to-Moderate Alzheimer's Disease

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Assessment of the cognitive domain psychomotor function through yes or no responses within 5 minutes to 30 trials; score range: 0 to 3.69. Performance variable: speed of performance; average of the log10 t transformed reaction time for correct responses. Reaction times longer than 5 seconds (log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain psychomotor function through yes or no responses within 5 minutes to 30 trials; score range: 0 to 3.69. Performance variable: speed of performance; average of the log10 t transformed reaction time for correct responses. Reaction times longer than 5 seconds (log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain psychomotor function through yes or no responses within 5 minutes to 30 trials; score range: 0 to 3.69. Performance variable: speed of performance; average of the log10 t transformed reaction time for correct responses. Reaction times longer than 5 seconds (log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain visual episodic memory (associate learning) through responses within 7 minutes to 4 targets x 4 rounds (mild AD) or 3 targets x 4 rounds (moderate AD); score range: 35 to 100. Performance variable: number of errors made in correctly placing each of the 4 patterns in their location four times.

Computerized Test Battery for Cognition (CogState) Tasks: One Back Working Memory at Week 1 [ Time Frame: Week 1 ]

Assessment of the cognitive domain working memory through yes or no responses to 30 trials within 5 minutes; score range: 0 to 1.57. Performance variable: accuracy of performance; arcsine transformation of proportion correct responses.

Computerized Test Battery for Cognition (CogState) Tasks: One Back Working Memory at Week 3 [ Time Frame: Week 3 ]

Assessment of the cognitive domain working memory through yes or no responses to 30 trials within 5 minutes; score range: 0 to 1.57. Performance variable: accuracy of performance; arcsine transformation of proportion correct responses.

Computerized Test Battery for Cognition (CogState) Tasks: One Back Working Memory at Week 6 [ Time Frame: Week 6 ]

Assessment of the cognitive domain working memory through yes or no responses to 30 trials within 5 minutes; score range: 0 to 1.57. Performance variable: accuracy of performance; arcsine transformation of proportion correct responses.

Assessment of the cognitive domain visual attention through a yes or no response to 30 trials within 5 minutes; score range: 0 to 3.69. Performance variable: speed of performance; average log10 transformed reaction time for correct responses. Reaction times longer than 5 seconds ( log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain visual attention through a yes or no response to 30 trials within 5 minutes; score range: 0 to 3.69. Performance variable: speed of performance; average log10 transformed reaction time for correct responses. Reaction times longer than 5 seconds ( log10 [5000]) were excluded as reflecting responses that were abnormally slow.

Assessment of the cognitive domain visual attention through a yes or no response to 30 trials within 5 minutes; score range: 0 to 3.69. Performance variable: speed of performance; average log10 transformed reaction time for correct responses. Reaction times longer than 5 seconds ( log10 [5000]) were excluded as reflecting responses that were abnormally slow.

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Ages Eligible for Study:

55 Years to 85 Years (Adult, Older Adult)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria:

Males or females, age 55-85

Diagnosis of probable Alzheimer's disease, consistent with criteria from both: 1) National Institute of Neurological and Communicable Disease and Stroke and Alzheimer's Disease and Related Disorders Association (NINCDS-ADRDA) and 2) Diagnostic and Statistical Manual of Mental Disorders (DSM IV)

Mini-mental status exam score of 14-26 inclusive

Rosen-Modified Hachinski Ischemia Score of < or = 4

Exclusion Criteria:

Diagnosis or history of other dementia or neurodegenerative disorders

Diagnosis or history of clinically significant cerebrovascular or cardiovascular disease